Engine Noise - Bearing Failure?

[Perfection]

Hi there,

This car is a bit troublesome for me...It was the engine light last few weeks..and now engine noise.

Let me try and describe the noise and hope it make sense.

The noise is very distinctive when at idle. Normally we have a cyclic (repetitive) clatter noise during idle as you would expect from a diesel. However, there is another oscillating noise which is kind of fade in and out on top of the idling clatter noise. This noise sounds like a mechanical friction or bearing problem.

This problem only happens since the dealer changed the ECU to fix the enigne light problem. I wonder if the new ECU is doing something funny. Or is it the car needed an oil change, its due soon...

I was wondering if anyone had any experience of this kind noise or similar noise with the engine. Or anyone had a bearing failure or mechanicla failure around 30k miles.

To be honest I'm quite annoyed with the dealer, having fixed the engine light issue they alos introduced another fault to the security light (LED). Now it keeps on flashing even when the car has started. And now the car has this strange noise.

Sorry for letting my steam out here....

Regards,

Perfect.